(6) باب إِفْرَادِ الإِقَامَةِ
It was narrated that Anas said:
"Bilal was commanded to say the phrases of the Adhan twice and the phrases of the Iqamah once." (RU)
Reference (RU): Sunan Ibn Majah 730 (RU)
In-book reference (RU): Book 3, Hadith 25 (RU)
English translation (RU): Vol. 1, Book 3, Hadith 730 (RU)